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x in (-oo:+oo)
(x-3)/2 = 5 // - 5
(x-3)/2-5 = 0
(x-3)/2+(-5*2)/2 = 0
x-5*2-3 = 0
x-13 = 0
(x-13)/2 = 0
(x-13)/2 = 0 // * 2
x-13 = 0
x-13 = 0 // + 13
x = 13
x = 13
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